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Abstract

Strong couplings between cavity modes in photonic molecules formed by two preselected nearly identical microdisk microcavities with embedded quantum dots are investigated. By continuously tuning the refractive index of one microdisk, clear anticrossings in the resonant peak energies associated with crossings in the peak linewidths can be observed. The coupling strengths are extracted by the coupled mode theory and analyzed by the model considering the effective potential confining the electromagnetic waves in the microcavities.

Figures (5)

(a) The micro-PL spectra of two individual MDs (MD1 and MD2). A simulated spectrum obtained from 3D-FDTD calculations is also shown. (b) The micro-PL spectra of MD1 and MD2 near the TE2,21 and TE1,25 modes before and after the two MDs were positioned to form a PM. The inset shows an image of the PM under an optical microscope.

(a) The peak energies of the upper and lower branches of the TE2,21 and TE1,25 WGMs in PM1 as a function of the heating laser power. (b) The corresponding energy difference between TE2,21 pair and TE1,25 pair (ΔE2,21 and ΔE1,25 respectively). (c) The evolution of the linewidths of the upper and lower branches of the TE1,25 mode with the heating laser power.

(a) The evolutions of the peak energies of the TE2,21 and TE1,25 modes of PM1 with the heating laser power. (b) The corresponding energy differences between the TE2,21 pair, TE1,25 pair and between the TE1,25-TE2,21 pair (ΔE2,21, ΔE1,25 and ΔE2,21-1,25 respectively) as a function of heating laser power.

(a) The 2D FDTD calculations of a PM formed by two identical MDs with 3.6 μm diameters and an inter-gap distance of 75 nm. The numbers marked in brackets are the energy splittings of each WGM pairs. (b) The effective potential, in unit of km2, for the TE1,25 and TE2,21 modes in a MD with a diameter of 3.6 μm. (c) The field intensities of the TE1,25 and TE2,21 modes calculated from Eq. (4). The inset shows the field intensities in log scale for the TE1,25 and TE2,21 modes outside the MDs.